[pgjdbc/pgjdbc] 03a144: fix: avoid NPE in PgConnection.finalize

Branch: refs/heads/master
  Home:   https://github.com/pgjdbc/pgjdbc
  Commit: 03a1441bbe98525412df754d3934141bc3b12168
      https://github.com/pgjdbc/pgjdbc/commit/03a1441bbe98525412df754d3934141bc3b12168
  Author: Vladimir Sitnikov <sitnikov.vladimir@gmail.com>
  Date:   2018-06-05 (Tue, 05 Jun 2018)

  Changed paths:
    M pgjdbc/src/main/java/org/postgresql/jdbc/PgConnection.java

  Log Message:
  -----------
  fix: avoid NPE in PgConnection.finalize

Note: the NPE is not visible to the end users as it can be caught in debugger only.

fixes #1206



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